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De Morgan, Augustus in addressee 
1860-1869::1868 in date 
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Herschel7213

From:
Sir John Herschel
To:
Augustus De Morgan
Date:
[18 April 1868]
Source of text:
RS:HS 24.215
Summary:

Comments on a number of mathematical matters, on a book on positivism, and increased sunspot activity.

Contributor:
John Herschel Project
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Transcription available